US Bridges

Csah 1 over Rock River Overflow

GoodPosted for load

Rock County, Minnesota · 1.6 MI E of JCT TH 75 · Structure no. 67531

Built
1991
34 years old
Condition
Good
inspected October 2024
Type
Slab
Wood or Timber
Length
95 ft
3 main spans
Daily traffic
466
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 1 over Rock River Overflow is a wood or timber slab carrying Csah 1 over Rock River Overflow in Rock County, Minnesota. It was built in 1991, so it is 34 years old, younger than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 466 vehicles a day, projected to reach 420 by 2042. The structure is 95 ft (28.9 m) long and 34 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesCsah 1
CrossesRock River Overflow
Location1.6 MI E of JCT TH 75
RouteCounty Highway 1
Coordinates43.54373, -96.18187
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length95 ft (28.9 m)
Longest span31 ft (9.6 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic466 (2022)
Projected traffic420 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 1 over Rock River Overflow built?

It was built in 1991, making it 34 years old in 2025.

What condition is Csah 1 over Rock River Overflow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Csah 1 over Rock River Overflow carry?

About 466 vehicles per day (2022 count).

How long is Csah 1 over Rock River Overflow?

The structure is 95 ft (28.9 m) long with a longest span of 31 ft (9.6 m) and a deck 34 ft wide.

Who owns Csah 1 over Rock River Overflow?

It is owned by the County Highway Agency.